{"gene":"MUTYH","run_date":"2026-06-10T05:19:51","timeline":{"discoveries":[{"year":2001,"finding":"Human MYH (hMYH) protein is localized to both nucleus and mitochondria, regulated by alternative splicing of its transcript, establishing that MUTYH initiates base excision repair of oxidized bases in both genomic compartments.","method":"Subcellular fractionation, immunodetection, alternative splicing analysis in human cells","journal":"Progress in nucleic acid research and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein detection in nuclear and mitochondrial fractions with mechanistic link to alternative splicing; single lab but orthogonal fractionation and molecular methods","pmids":["11554314"],"is_preprint":false},{"year":2004,"finding":"MUTYH C-terminal domain prevents APE1 from incising the AP site generated after adenine excision from A:8-oxoG, and prevents OGG1 from excising 8-oxoG opposite the AP site. Mutations R361A and G365D in the C-terminal domain abolished this protective function without affecting glycosylase activity, demonstrating that product protection is an intrinsic function of the C-terminal domain.","method":"In vitro glycosylase assay with recombinant proteins, site-directed mutagenesis, cell-free extract assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro with purified proteins plus mutagenesis, multiple orthogonal assays in one study","pmids":["15199168"],"is_preprint":false},{"year":2004,"finding":"A splice-site variant (IVS10-2A>G) of MYH produces an aberrant mRNA encoding a truncated protein that is NOT localized to the nucleus, demonstrating that nuclear localization of wild-type MYH requires the intact C-terminal region encoded by exon 10 onward.","method":"RT-PCR for aberrant transcript detection; immunofluorescence for subcellular localization of wild-type vs. variant protein","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunofluorescence directly comparing WT and variant localization; single lab, two orthogonal methods (RT-PCR + IF)","pmids":["15180946"],"is_preprint":false},{"year":2006,"finding":"Human MYH physically interacts with the checkpoint clamp proteins Hus1 and Rad1 (but not Rad9) of the 9-1-1 complex. The major Hus1-binding site maps to residues 295–350 of hMYH (interdomain connector). Val315 is critical for Hus1 binding. The 9-1-1 complex stimulates SpMYH glycosylase activity, and MYH-Hus1 interaction is enhanced following ionizing radiation; MYH nuclear foci co-localize with Rad9 foci after H2O2 treatment.","method":"Co-immunoprecipitation (human and S. pombe), yeast two-hybrid mapping, in vitro glycosylase activity assay, site-directed mutagenesis, immunofluorescence co-localization","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP across species, mutagenesis mapping, functional stimulation assay, and co-localization; multiple orthogonal methods in one study","pmids":["16879101"],"is_preprint":false},{"year":2008,"finding":"Nine MUTYH missense/frameshift mutants and two SNPs were characterized for DNA glycosylase and DNA binding activities in vitro. Y165C, R231H, and P281L were severely defective in both activities; R260Q and G382D were partially active; frameshift mutants (Y90X, Q377X, E466X, 1103delC) completely lacked both activities. SNP Q324H was partially impaired in adenine removal.","method":"In vitro glycosylase assay and DNA binding assay with synthetic oligonucleotide substrates, PAGE analysis of cleavage products","journal":"Gastroenterology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic assay with purified recombinant variants, systematic mutagenesis across 11 variants, orthogonal binding and activity assays","pmids":["18534194"],"is_preprint":false},{"year":2009,"finding":"MUTYH and DNA polymerase lambda (pol λ) together reconstitute the complete base excision repair pathway for A:8-oxoG mispairs. MUTYH, pol λ, PCNA, FEN1, and DNA ligases I and III are specifically recruited from human cell extracts to A:8-oxoG DNA. Full-pathway repair was reconstituted in vitro using purified human MUTYH, pol λ, FEN1, and DNA ligase I.","method":"In vitro BER reconstitution with purified human proteins; immunofluorescence of protein recruitment in ROS-treated cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — full-pathway reconstitution with purified proteins plus cell-based immunofluorescence recruitment; two orthogonal approaches in one study","pmids":["19820168"],"is_preprint":false},{"year":2009,"finding":"MSH2 and MUTYH provide largely separate, independent repair functions for oxidative DNA damage in vivo. Msh2−/−Mutyh−/− mouse embryo fibroblasts show 8-oxoG levels comparable to single knockouts, but synergistic 8-oxoG accumulation occurs in vivo tissues. Paradoxically, Msh2−/−Mutyh−/− mice show delayed lymphomagenesis relative to Msh2−/− mice, indicating that a large fraction of the cancer phenotype of Msh2 deficiency depends on MUTYH activity.","method":"Double knockout mouse model, hprt mutation frequency assay in MEFs, 8-oxoG measurement by immunoassay, tumor incidence analysis","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via double KO mouse with multiple quantitative phenotypic readouts; replicated across cell and animal level","pmids":["19435918"],"is_preprint":false},{"year":2011,"finding":"MUTYH-generated single-strand breaks (SSBs) in nuclear DNA trigger PARP-dependent cell death, while SSBs in mitochondrial DNA trigger calpain-dependent neuronal loss, revealing that MUTYH initiates two distinct caspase-independent death pathways. Loss of MUTYH suppresses programmed cell death under oxidative stress, allowing escape from death but accumulation of mutations in APC/KRAS.","method":"Genetic KO mouse models (MUTYH−/−, OGG1/MUTYH double KO), PARP inhibitor and calpain inhibitor pharmacology, measurement of SSBs","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with inhibitor validation in mouse models; single lab, multiple pathway dissection","pmids":["21235684"],"is_preprint":false},{"year":2012,"finding":"MUTYH-mediated excision repair of 8-oxoG-paired adenine triggers neurodegeneration. MUTYH-deficient (Mutyh−/−) or OGG1/MUTYH double-KO mice were resistant to striatal neurodegeneration caused by 8-oxoG accumulation, whereas OGG1−/− or MTH1−/− mice showed severe degeneration. MUTYH-generated SSBs in neuronal mitochondrial DNA activated calpain-dependent death; delayed nuclear 8-oxoG accumulation in microglia triggered PARP-AIF-dependent microgliosis.","method":"Genetic KO mouse models (Mutyh−/−, Ogg1−/−, Mth1−/−, double/triple combinations), mtDNA 8-oxoG quantification, PARP/calpain pathway analysis, histopathology","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic KO combinations with mechanistic pathway dissection, replicated across neuron and microglial compartments, two distinct death pathways identified","pmids":["23143307"],"is_preprint":false},{"year":2013,"finding":"MYH physically interacts with APE1 via the interdomain connector (IDC). NMR chemical shift perturbation mapped the hMYH IDC peptide binding to the DNA-binding site of APE1 and a distal site (key residues N212 and Q137 of APE1). Hus1 stabilizes the MYH/APE1 complex both in vitro and in cells without competing for MYH binding.","method":"NMR chemical shift perturbation, Co-IP in cells, in vitro binding assays","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 1 / Strong — NMR structural mapping of binding interface plus cellular Co-IP validation; orthogonal methods including residue-level mutagenesis implications","pmids":["24209961"],"is_preprint":false},{"year":2013,"finding":"MYH knockdown in HeLa cells increases sensitivity to H2O2, elevates 8-oxoG levels, alters cell cycle progression, and enhances apoptosis after oxidative stress. Overexpression of mouse Myh in MMR-defective HCT15 cells confers resistance to oxidant killing and apoptosis, establishing a protective role in the cellular response to oxidative DNA damage.","method":"siRNA knockdown and cDNA overexpression, cell viability assays, flow cytometry, immunofluorescence for 8-oxoG","journal":"DNA repair","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain- and loss-of-function with multiple cellular phenotype readouts; single lab","pmids":["24315136"],"is_preprint":false},{"year":2014,"finding":"MUTYH is transcriptionally regulated by p53 through a functional p53-binding site in the MUTYH gene, identified in MLH1-proficient colorectal cancer cells. MUTYH mediates p53-dependent, PARP-dependent caspase-independent cell death; siRNA knockdown of MUTYH, p53 inhibition, or PARP inhibition each suppressed cell death without additive effect, placing MUTYH downstream of p53 in this pathway.","method":"Luciferase reporter assay for p53 binding site, siRNA knockdown, pharmacological inhibitors (p53 inhibitor, PARP inhibitor), cell death assays","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional p53 binding site confirmed, epistasis via siRNA + inhibitors; single lab, multiple orthogonal approaches","pmids":["25310643"],"is_preprint":false},{"year":2015,"finding":"SIRT6 physically interacts with MYH glycosylase, APE1, and the 9-1-1 checkpoint clamp. These interactions are enhanced after oxidative stress. SIRT6, APE1, and Hus1 all bind the interdomain connector (IDC) of MYH at overlapping but distinct motifs and do not compete; instead, each partner enhances the others' association with MYH. MYH and SIRT6 are co-recruited to oxidative DNA damage sites in transcriptionally active chromatin; Sirt6 depletion causes MYH foci to localize on telomeres.","method":"Co-IP, site-directed mutagenesis of IDC, immunofluorescence at laser-induced damage sites, chromatin fractionation","journal":"BMC molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, mutagenesis mapping, co-localization at damage sites, multiple interaction partners tested orthogonally in same study","pmids":["26063178"],"is_preprint":false},{"year":2015,"finding":"Functional complementation assay in MutY-disrupted E. coli for 47 MUTYH missense variants established which variants severely impair MUTYH glycosylase function (fail to suppress G:C→T:A mutations) vs. retain near-wild-type activity. Structural prediction based on MutY crystal structure allowed interpretation of effects on catalytic activity or protein stability.","method":"In vivo complementation assay (spontaneous mutation rate in MutY-deficient E. coli), site-directed mutagenesis, in silico structural modeling","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — functional in vivo assay with 47 variants; single lab, complemented by structural modeling but no direct biochemical reconstitution of human protein","pmids":["25820570"],"is_preprint":false},{"year":2017,"finding":"BER/SSBR proteins including MYH are present on nascent DNA at replication forks, demonstrated by iPOND (isolation of proteins on nascent DNA) coupled with targeted mass spectrometry, establishing that MYH operates post-replicatively at the replication fork.","method":"iPOND combined with targeted mass spectrometry on nascent DNA in human cells","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — iPOND/MS directly identifies MYH on nascent DNA; single lab but rigorous biochemical approach","pmids":["28575236"],"is_preprint":false},{"year":2018,"finding":"Wild-type human MUTYH contains a redox-active [4Fe4S] cluster. The pathogenic variant MUTYH C306W (cysteine ligating the cluster replaced by tryptophan) undergoes rapid oxidative degradation of its [4Fe4S]2+ cluster to [3Fe4S]+, abolishing redox signalling, reducing DNA binding, and impairing enzymatic function. This demonstrates that redox activity of the [4Fe4S] cluster is essential for MUTYH's DNA damage localization mechanism.","method":"DNA electrochemistry, EPR spectroscopy, DNA binding assay, glycosylase activity assay, site-directed mutagenesis","journal":"Nature chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrochemical measurement of redox activity, EPR confirmation of cluster degradation, biochemical activity assays; multiple orthogonal methods in single rigorous study","pmids":["29915346"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of mouse MUTYH in complex with DNA and of the MUTYH C-terminal domain with human PCNA revealed the molecular mechanism for A:8-oxoG mispair recognition and excision, including the role of PCNA in replication-coupled repair. The Zn-binding motif in the IDC was resolved as one histidine and three cysteine residues. The IDC surface exposure explains interaction modes with 9-1-1 and APE1. Several MAP mutations perturb residues critical to catalytic function.","method":"X-ray crystallography (MUTYH–DNA complex; MUTYH C-terminal domain–PCNA complex), structural analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structures with functional validation of catalytic mechanism and interaction interfaces; single study with multiple complex structures","pmids":["34142156"],"is_preprint":false},{"year":2021,"finding":"UV-DDB stimulates MUTYH turnover 4–5-fold by directly interacting with MUTYH and displacing it from abasic sites (product inhibition relief). Single-molecule fluorescence showed UV-DDB decreases MUTYH half-life on abasic-site DNA from ~8800 s to ~590 s. EMSA and AFM confirmed transient complex formation between MUTYH and UV-DDB.","method":"Bulk kinetic assay, EMSA, atomic force microscopy, single-molecule fluorescence imaging","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — single-molecule kinetics plus bulk assay plus AFM; multiple orthogonal methods in one study rigorously establishing mechanism of product release","pmids":["34232996"],"is_preprint":false},{"year":2016,"finding":"MUTYH-mediated base excision repair in microglia promotes microglial activation and photoreceptor cell death in a mouse model of retinitis pigmentosa (rd10 mice). Mutyh deficiency prevented SSB formation in microglia, suppressed microglial activation and the inflammatory/cytotoxic phenotype under oxidative stress, and reduced photoreceptor cell death.","method":"Mutyh knockout in rd10 mouse model, immunofluorescence for SSBs and PARP activation, primary microglial culture under oxidative stress, histopathology","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in disease mouse model with mechanistic SSB/PARP pathway readouts and primary cell validation; single lab","pmids":["27699246"],"is_preprint":false},{"year":2012,"finding":"Werner syndrome helicase (WRN) is recruited to 8-oxoG:A mispairs in a manner dependent on DNA polymerase λ (Polλ). MUTYH is required for nuclear focus formation of both WRN and Polλ following oxidative stress. WRN binds the catalytic domain of Polλ and specifically stimulates gap-filling by Polλ over 8-oxoG. MUTYH depletion suppresses hypersensitivity of WRN/Polλ-deficient cells to oxidative stress.","method":"Co-immunoprecipitation, immunofluorescence (focus formation), siRNA knockdown, cell viability assay, in vitro DNA synthesis assay with purified proteins","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis via siRNA, biochemical reconstitution of WRN stimulation of Polλ, co-localization; multiple orthogonal methods","pmids":["22753033"],"is_preprint":false},{"year":2016,"finding":"MUTYH glycosylase activity on 8-oxoG-containing trinucleotide repeat sequences generates closely spaced incisions on opposite strands (together with OGG1), creating conditions permissive for CAG/CTG repeat expansion in vitro. This was confirmed in R6/2 HD mouse brain areas showing elevated 8-oxodG and expression of both glycosylases.","method":"In vitro BER assay on TNR substrates with purified OGG1, MUTYH, and pol β; immunohistochemistry and 8-oxodG measurement in HD mouse brain","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution on TNR substrates plus in vivo mouse brain correlation; single lab, mechanistic but not fully reconstituted with all repair factors","pmids":["26980281"],"is_preprint":false}],"current_model":"MUTYH (MYH) is a base-excision repair adenine-DNA glycosylase that removes mispaired adenine from A:8-oxoG lesions arising after oxidative DNA damage or misincorporation during replication; it operates post-replicatively at the replication fork in complex with PCNA, coordinates sequentially with APE1 (whose activity it transiently suppresses via its C-terminal domain), DNA pol λ, FEN1, and DNA ligase I to complete repair; its interdomain connector (IDC) harbors a Zn-binding motif and serves as a scaffold for interactions with the 9-1-1 checkpoint clamp (Hus1/Rad1), APE1, SIRT6, and WRN, all of which enhance repair efficiency; the [4Fe4S] cluster in MUTYH is redox-active and mediates rapid DNA-mediated localization to lesions; MUTYH-generated single-strand breaks also trigger two distinct p53/PARP- and calpain-dependent caspase-independent cell death pathways that suppress tumorigenesis, but under conditions of chronic oxidative stress in neurons and microglia these same pathways drive neurodegeneration."},"narrative":{"mechanistic_narrative":"MUTYH is a base-excision repair adenine-DNA glycosylase that removes adenine misincorporated opposite 8-oxoguanine (A:8-oxoG), suppressing the G:C→T:A transversions that arise from oxidative DNA damage [PMID:18534194, PMID:34142156]. It functions in both nuclear and mitochondrial genomes, with compartment targeting governed by alternative splicing and an intact C-terminal region required for nuclear localization [PMID:11554314, PMID:15180946]. Structural and biochemical work resolved how MUTYH recognizes and excises the A:8-oxoG mispair and how its C-terminal domain engages PCNA for replication-coupled repair, consistent with its detection on nascent DNA at replication forks [PMID:34142156, PMID:28575236]. After adenine excision, MUTYH coordinates downstream steps: its C-terminal domain transiently protects the abasic product from premature APE1 incision and OGG1 action [PMID:15199168], while UV-DDB relieves this product inhibition to accelerate MUTYH turnover from abasic sites [PMID:34232996], and DNA polymerase λ, FEN1, and DNA ligase I complete repair [PMID:19820168]. The interdomain connector, which carries a Zn-binding His/Cys motif, is a scaffold for partners that enhance repair efficiency, including the 9-1-1 checkpoint clamp (Hus1/Rad1), APE1, and SIRT6, which assemble at oxidative damage sites without mutual competition [PMID:16879101, PMID:24209961, PMID:26063178]; MUTYH also organizes WRN and Pol λ focus formation at 8-oxoG:A lesions [PMID:22753033]. A redox-active [4Fe4S] cluster is essential for DNA-mediated localization to lesions, and its loss in pathogenic variants abolishes redox signalling and impairs activity [PMID:29915346]. Beyond repair, MUTYH-generated single-strand breaks initiate p53- and PARP-dependent and calpain-dependent caspase-independent cell death pathways that suppress tumorigenesis but drive neurodegeneration, microglial activation, and photoreceptor loss under chronic oxidative stress [PMID:21235684, PMID:23143307, PMID:25310643, PMID:27699246]. Numerous MUTYH missense and truncating variants abolish glycosylase and DNA-binding activity, linking loss of this repair function to colorectal tumorigenesis [PMID:18534194, PMID:25820570].","teleology":[{"year":2001,"claim":"Established that MUTYH initiates oxidative base-excision repair in both nuclear and mitochondrial genomes, defining the compartmental scope of its action via alternative splicing.","evidence":"Subcellular fractionation, immunodetection, and splicing analysis in human cells","pmids":["11554314"],"confidence":"Medium","gaps":["Splice isoform sequences not fully mapped","Relative repair contribution of each compartment not quantified"]},{"year":2004,"claim":"Showed that the MUTYH C-terminal domain protects the abasic product from premature APE1/OGG1 action, revealing intrinsic coordination of repair handoff; nuclear localization was mapped to the intact C-terminal region.","evidence":"In vitro glycosylase/cell-free extract assays with mutagenesis; RT-PCR and immunofluorescence of a splice variant","pmids":["15199168","15180946"],"confidence":"High","gaps":["Structural basis of product protection not resolved here","Nuclear import signal not precisely defined"]},{"year":2006,"claim":"Identified the 9-1-1 checkpoint clamp (Hus1/Rad1) as a direct MUTYH partner that stimulates glycosylase activity, connecting base repair to DNA damage checkpoint signalling.","evidence":"Reciprocal Co-IP across species, yeast two-hybrid mapping, glycosylase assay, mutagenesis, co-localization","pmids":["16879101"],"confidence":"High","gaps":["Stoichiometry of the MUTYH–9-1-1 complex unknown","In vivo checkpoint consequence of this interaction not quantified"]},{"year":2008,"claim":"Systematically classified disease-associated MUTYH variants by their glycosylase and DNA-binding defects, providing a functional basis for genotype interpretation.","evidence":"In vitro glycosylase and DNA binding assays on purified recombinant variants","pmids":["18534194"],"confidence":"High","gaps":["In vitro defects not all linked to clinical outcomes","Effects on protein stability vs catalysis not separated for all variants"]},{"year":2009,"claim":"Reconstituted the complete A:8-oxoG repair pathway and showed MUTYH recruits pol λ, PCNA, FEN1, and DNA ligase, while genetic epistasis distinguished MUTYH from MSH2-dependent oxidative repair.","evidence":"In vitro BER reconstitution with purified proteins, recruitment immunofluorescence, and Msh2/Mutyh double-knockout mouse analysis","pmids":["19820168","19435918"],"confidence":"High","gaps":["Order and timing of factor handoffs not fully resolved","Tissue-specificity of MSH2/MUTYH overlap unexplained"]},{"year":2011,"claim":"Demonstrated that MUTYH-generated single-strand breaks initiate two distinct caspase-independent cell death pathways (nuclear PARP-dependent, mitochondrial calpain-dependent), reframing MUTYH as both a repair enzyme and a death-signalling trigger.","evidence":"Knockout mouse models with PARP and calpain inhibitor pharmacology and SSB measurement","pmids":["21235684"],"confidence":"Medium","gaps":["Molecular link from SSB to each death effector incomplete","Single lab"]},{"year":2012,"claim":"Extended the death-pathway model to neurodegeneration and identified WRN/Pol λ as MUTYH-dependent downstream repair factors at 8-oxoG:A lesions.","evidence":"Multiple genetic KO mouse combinations with pathway dissection; Co-IP, focus-formation, siRNA, and in vitro Pol λ stimulation assays","pmids":["23143307","22753033"],"confidence":"High","gaps":["Triggers of compartment-specific death not fully defined","Human neuronal relevance not directly tested"]},{"year":2013,"claim":"Mapped the APE1 interaction to the MUTYH interdomain connector at residue level and showed Hus1 stabilizes the complex, defining the IDC as a multi-partner repair scaffold; cellular assays confirmed a protective role against oxidative stress.","evidence":"NMR chemical shift perturbation, Co-IP, in vitro binding; siRNA/overexpression with viability and 8-oxoG readouts","pmids":["24209961","24315136"],"confidence":"High","gaps":["Dynamics of partner exchange on the IDC unresolved","Cellular phenotype work is single lab"]},{"year":2014,"claim":"Placed MUTYH transcriptionally downstream of p53 and mechanistically within a p53/PARP-dependent caspase-independent death pathway, linking repair capacity to tumor-suppressive cell death.","evidence":"p53-binding-site luciferase reporter, siRNA, and pharmacological inhibitor epistasis in colorectal cancer cells","pmids":["25310643"],"confidence":"Medium","gaps":["Direct p53 occupancy in vivo not shown","Single lab"]},{"year":2015,"claim":"Defined SIRT6 as an additional IDC partner that, with APE1 and Hus1, cooperatively enhances complex assembly and chromatin recruitment; an E. coli complementation screen functionally classified 47 variants.","evidence":"Co-IP, IDC mutagenesis, laser-damage co-localization, chromatin fractionation; in vivo MutY-complementation assay with structural modeling","pmids":["26063178","25820570"],"confidence":"High","gaps":["Functional role of telomeric MYH relocalization upon SIRT6 loss unknown","Complementation lacks human-protein biochemical reconstitution"]},{"year":2017,"claim":"Established that MUTYH operates post-replicatively at the replication fork by detecting it on nascent DNA.","evidence":"iPOND coupled with targeted mass spectrometry on nascent DNA","pmids":["28575236"],"confidence":"Medium","gaps":["Direct coupling to fork-associated machinery not shown","Single lab"]},{"year":2018,"claim":"Demonstrated that the redox-active [4Fe4S] cluster is essential for MUTYH's DNA-mediated lesion localization, and that a pathogenic variant disrupts cluster integrity.","evidence":"DNA electrochemistry, EPR, DNA binding and glycosylase assays with mutagenesis","pmids":["29915346"],"confidence":"High","gaps":["In vivo contribution of redox search to repair kinetics not quantified","Generality across other variants untested"]},{"year":2021,"claim":"Resolved the structural basis of A:8-oxoG recognition and PCNA-coupled repair and defined the IDC Zn-binding motif; identified UV-DDB as a turnover factor that relieves MUTYH product inhibition at abasic sites.","evidence":"X-ray crystallography of MUTYH–DNA and MUTYH C-terminal–PCNA complexes; bulk kinetics, EMSA, AFM, and single-molecule imaging of UV-DDB displacement","pmids":["34142156","34232996"],"confidence":"High","gaps":["Coordination of UV-DDB with APE1/PCNA handoff not integrated","Human full-length structure with partners not solved"]},{"year":2016,"claim":"Showed disease contexts where MUTYH activity is deleterious: microglial BER drives photoreceptor death in retinitis pigmentosa, and MUTYH/OGG1 incisions on 8-oxoG-containing repeats create conditions for trinucleotide-repeat expansion.","evidence":"Mutyh KO in rd10 mouse with SSB/PARP readouts; in vitro BER on TNR substrates with HD mouse brain correlation","pmids":["27699246","26980281"],"confidence":"Medium","gaps":["Causality of MUTYH in human repeat-expansion disease not shown","Full repeat-expansion mechanism not reconstituted"]},{"year":null,"claim":"How the competing repair-completing and death-signalling fates of a MUTYH-generated abasic site/SSB are selected in vivo, and how partner exchange on the IDC is temporally regulated, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No mechanism distinguishing productive repair from death-triggering breaks","Temporal ordering of IDC partner binding unknown","Mitochondrial MUTYH repair pathway less characterized than nuclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140097","term_label":"catalytic activity, acting on DNA","supporting_discovery_ids":[4,5,16]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[1,4]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[4,15]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[3,9,12]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,7]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[14,16]}],"pathway":[{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[4,5,16]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[7,8,11]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[10,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,18,20]}],"complexes":["9-1-1 (Hus1/Rad1) checkpoint clamp"],"partners":["APE1","HUS1","RAD1","SIRT6","PCNA","WRN","POLL","DDB2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9UIF7","full_name":"Adenine DNA glycosylase","aliases":["MutY homolog","hMYH"],"length_aa":546,"mass_kda":60.1,"function":"Involved in oxidative DNA damage repair. Initiates repair of A*oxoG to C*G by removing the inappropriately paired adenine base from the DNA backbone. Possesses both adenine and 2-OH-A DNA glycosylase activities","subcellular_location":"Nucleus; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/Q9UIF7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MUTYH","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MUTYH","total_profiled":1310},"omim":[{"mim_id":"617108","title":"SESSILE SERRATED POLYPOSIS CANCER SYNDROME; SSPCS","url":"https://www.omim.org/entry/617108"},{"mim_id":"613931","title":"TARGET OF EGR1; TOE1","url":"https://www.omim.org/entry/613931"},{"mim_id":"613659","title":"GASTRIC CANCER","url":"https://www.omim.org/entry/613659"},{"mim_id":"608456","title":"FAMILIAL ADENOMATOUS POLYPOSIS 2; 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oncology","url":"https://pubmed.ncbi.nlm.nih.gov/38394468","citation_count":23,"is_preprint":false},{"pmid":"17252231","id":"PMC_17252231","title":"MYH, OGG1, MTH1, and APC alterations involved in the colorectal tumorigenesis of Korean patients with multiple adenomas.","date":"2007","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/17252231","citation_count":22,"is_preprint":false},{"pmid":"22753033","id":"PMC_22753033","title":"Involvement of Werner syndrome protein in MUTYH-mediated repair of oxidative DNA damage.","date":"2012","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/22753033","citation_count":22,"is_preprint":false},{"pmid":"29915346","id":"PMC_29915346","title":"A human MUTYH variant linking colonic polyposis to redox degradation of the [4Fe4S]2+ cluster.","date":"2018","source":"Nature chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/29915346","citation_count":22,"is_preprint":false},{"pmid":"17703316","id":"PMC_17703316","title":"Germline mutations of the MYH gene in Korean patients with multiple colorectal adenomas.","date":"2007","source":"International journal of colorectal disease","url":"https://pubmed.ncbi.nlm.nih.gov/17703316","citation_count":22,"is_preprint":false},{"pmid":"19932167","id":"PMC_19932167","title":"A common mutation of the MYH gene is associated with increased DNA oxidation and age-related diseases.","date":"2009","source":"Free radical biology & medicine","url":"https://pubmed.ncbi.nlm.nih.gov/19932167","citation_count":21,"is_preprint":false},{"pmid":"17219385","id":"PMC_17219385","title":"Germline MYH mutations in a clinic-based series of Canadian multiple colorectal adenoma patients.","date":"2007","source":"Journal of surgical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/17219385","citation_count":21,"is_preprint":false},{"pmid":"23605219","id":"PMC_23605219","title":"MUTYH-associated colorectal cancer and adenomatous polyposis.","date":"2013","source":"Surgery today","url":"https://pubmed.ncbi.nlm.nih.gov/23605219","citation_count":20,"is_preprint":false},{"pmid":"22103048","id":"PMC_22103048","title":"The genetics of familial adenomatous polyposis (FAP) and MutYH-associated polyposis (MAP).","date":"2011","source":"Acta gastro-enterologica Belgica","url":"https://pubmed.ncbi.nlm.nih.gov/22103048","citation_count":20,"is_preprint":false},{"pmid":"34142156","id":"PMC_34142156","title":"Structure of the mammalian adenine DNA glycosylase MUTYH: insights into the base excision repair pathway and cancer.","date":"2021","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/34142156","citation_count":20,"is_preprint":false},{"pmid":"26511139","id":"PMC_26511139","title":"Correlation between mutations and mRNA expression of APC and MUTYH genes: new insight into hereditary colorectal polyposis predisposition.","date":"2015","source":"Journal of experimental & clinical cancer research : CR","url":"https://pubmed.ncbi.nlm.nih.gov/26511139","citation_count":20,"is_preprint":false},{"pmid":"27393652","id":"PMC_27393652","title":"Genetic association of MYH genes with hereditary hearing loss in Korea.","date":"2016","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/27393652","citation_count":20,"is_preprint":false},{"pmid":"16890597","id":"PMC_16890597","title":"Immunohistochemical expression of MYH protein can be used to identify patients with MYH-associated polyposis.","date":"2006","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/16890597","citation_count":19,"is_preprint":false},{"pmid":"34232996","id":"PMC_34232996","title":"Single molecule analysis indicates stimulation of MUTYH by UV-DDB through enzyme turnover.","date":"2021","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/34232996","citation_count":19,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51681,"output_tokens":5692,"usd":0.120211,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14397,"output_tokens":4904,"usd":0.097293,"stage2_stop_reason":"end_turn"},"total_usd":0.217504,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"Human MYH (hMYH) protein is localized to both nucleus and mitochondria, regulated by alternative splicing of its transcript, establishing that MUTYH initiates base excision repair of oxidized bases in both genomic compartments.\",\n      \"method\": \"Subcellular fractionation, immunodetection, alternative splicing analysis in human cells\",\n      \"journal\": \"Progress in nucleic acid research and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein detection in nuclear and mitochondrial fractions with mechanistic link to alternative splicing; single lab but orthogonal fractionation and molecular methods\",\n      \"pmids\": [\"11554314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MUTYH C-terminal domain prevents APE1 from incising the AP site generated after adenine excision from A:8-oxoG, and prevents OGG1 from excising 8-oxoG opposite the AP site. Mutations R361A and G365D in the C-terminal domain abolished this protective function without affecting glycosylase activity, demonstrating that product protection is an intrinsic function of the C-terminal domain.\",\n      \"method\": \"In vitro glycosylase assay with recombinant proteins, site-directed mutagenesis, cell-free extract assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro with purified proteins plus mutagenesis, multiple orthogonal assays in one study\",\n      \"pmids\": [\"15199168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A splice-site variant (IVS10-2A>G) of MYH produces an aberrant mRNA encoding a truncated protein that is NOT localized to the nucleus, demonstrating that nuclear localization of wild-type MYH requires the intact C-terminal region encoded by exon 10 onward.\",\n      \"method\": \"RT-PCR for aberrant transcript detection; immunofluorescence for subcellular localization of wild-type vs. variant protein\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunofluorescence directly comparing WT and variant localization; single lab, two orthogonal methods (RT-PCR + IF)\",\n      \"pmids\": [\"15180946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Human MYH physically interacts with the checkpoint clamp proteins Hus1 and Rad1 (but not Rad9) of the 9-1-1 complex. The major Hus1-binding site maps to residues 295–350 of hMYH (interdomain connector). Val315 is critical for Hus1 binding. The 9-1-1 complex stimulates SpMYH glycosylase activity, and MYH-Hus1 interaction is enhanced following ionizing radiation; MYH nuclear foci co-localize with Rad9 foci after H2O2 treatment.\",\n      \"method\": \"Co-immunoprecipitation (human and S. pombe), yeast two-hybrid mapping, in vitro glycosylase activity assay, site-directed mutagenesis, immunofluorescence co-localization\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP across species, mutagenesis mapping, functional stimulation assay, and co-localization; multiple orthogonal methods in one study\",\n      \"pmids\": [\"16879101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nine MUTYH missense/frameshift mutants and two SNPs were characterized for DNA glycosylase and DNA binding activities in vitro. Y165C, R231H, and P281L were severely defective in both activities; R260Q and G382D were partially active; frameshift mutants (Y90X, Q377X, E466X, 1103delC) completely lacked both activities. SNP Q324H was partially impaired in adenine removal.\",\n      \"method\": \"In vitro glycosylase assay and DNA binding assay with synthetic oligonucleotide substrates, PAGE analysis of cleavage products\",\n      \"journal\": \"Gastroenterology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic assay with purified recombinant variants, systematic mutagenesis across 11 variants, orthogonal binding and activity assays\",\n      \"pmids\": [\"18534194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MUTYH and DNA polymerase lambda (pol λ) together reconstitute the complete base excision repair pathway for A:8-oxoG mispairs. MUTYH, pol λ, PCNA, FEN1, and DNA ligases I and III are specifically recruited from human cell extracts to A:8-oxoG DNA. Full-pathway repair was reconstituted in vitro using purified human MUTYH, pol λ, FEN1, and DNA ligase I.\",\n      \"method\": \"In vitro BER reconstitution with purified human proteins; immunofluorescence of protein recruitment in ROS-treated cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — full-pathway reconstitution with purified proteins plus cell-based immunofluorescence recruitment; two orthogonal approaches in one study\",\n      \"pmids\": [\"19820168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MSH2 and MUTYH provide largely separate, independent repair functions for oxidative DNA damage in vivo. Msh2−/−Mutyh−/− mouse embryo fibroblasts show 8-oxoG levels comparable to single knockouts, but synergistic 8-oxoG accumulation occurs in vivo tissues. Paradoxically, Msh2−/−Mutyh−/− mice show delayed lymphomagenesis relative to Msh2−/− mice, indicating that a large fraction of the cancer phenotype of Msh2 deficiency depends on MUTYH activity.\",\n      \"method\": \"Double knockout mouse model, hprt mutation frequency assay in MEFs, 8-oxoG measurement by immunoassay, tumor incidence analysis\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via double KO mouse with multiple quantitative phenotypic readouts; replicated across cell and animal level\",\n      \"pmids\": [\"19435918\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MUTYH-generated single-strand breaks (SSBs) in nuclear DNA trigger PARP-dependent cell death, while SSBs in mitochondrial DNA trigger calpain-dependent neuronal loss, revealing that MUTYH initiates two distinct caspase-independent death pathways. Loss of MUTYH suppresses programmed cell death under oxidative stress, allowing escape from death but accumulation of mutations in APC/KRAS.\",\n      \"method\": \"Genetic KO mouse models (MUTYH−/−, OGG1/MUTYH double KO), PARP inhibitor and calpain inhibitor pharmacology, measurement of SSBs\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with inhibitor validation in mouse models; single lab, multiple pathway dissection\",\n      \"pmids\": [\"21235684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MUTYH-mediated excision repair of 8-oxoG-paired adenine triggers neurodegeneration. MUTYH-deficient (Mutyh−/−) or OGG1/MUTYH double-KO mice were resistant to striatal neurodegeneration caused by 8-oxoG accumulation, whereas OGG1−/− or MTH1−/− mice showed severe degeneration. MUTYH-generated SSBs in neuronal mitochondrial DNA activated calpain-dependent death; delayed nuclear 8-oxoG accumulation in microglia triggered PARP-AIF-dependent microgliosis.\",\n      \"method\": \"Genetic KO mouse models (Mutyh−/−, Ogg1−/−, Mth1−/−, double/triple combinations), mtDNA 8-oxoG quantification, PARP/calpain pathway analysis, histopathology\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic KO combinations with mechanistic pathway dissection, replicated across neuron and microglial compartments, two distinct death pathways identified\",\n      \"pmids\": [\"23143307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MYH physically interacts with APE1 via the interdomain connector (IDC). NMR chemical shift perturbation mapped the hMYH IDC peptide binding to the DNA-binding site of APE1 and a distal site (key residues N212 and Q137 of APE1). Hus1 stabilizes the MYH/APE1 complex both in vitro and in cells without competing for MYH binding.\",\n      \"method\": \"NMR chemical shift perturbation, Co-IP in cells, in vitro binding assays\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — NMR structural mapping of binding interface plus cellular Co-IP validation; orthogonal methods including residue-level mutagenesis implications\",\n      \"pmids\": [\"24209961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MYH knockdown in HeLa cells increases sensitivity to H2O2, elevates 8-oxoG levels, alters cell cycle progression, and enhances apoptosis after oxidative stress. Overexpression of mouse Myh in MMR-defective HCT15 cells confers resistance to oxidant killing and apoptosis, establishing a protective role in the cellular response to oxidative DNA damage.\",\n      \"method\": \"siRNA knockdown and cDNA overexpression, cell viability assays, flow cytometry, immunofluorescence for 8-oxoG\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain- and loss-of-function with multiple cellular phenotype readouts; single lab\",\n      \"pmids\": [\"24315136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MUTYH is transcriptionally regulated by p53 through a functional p53-binding site in the MUTYH gene, identified in MLH1-proficient colorectal cancer cells. MUTYH mediates p53-dependent, PARP-dependent caspase-independent cell death; siRNA knockdown of MUTYH, p53 inhibition, or PARP inhibition each suppressed cell death without additive effect, placing MUTYH downstream of p53 in this pathway.\",\n      \"method\": \"Luciferase reporter assay for p53 binding site, siRNA knockdown, pharmacological inhibitors (p53 inhibitor, PARP inhibitor), cell death assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional p53 binding site confirmed, epistasis via siRNA + inhibitors; single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"25310643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIRT6 physically interacts with MYH glycosylase, APE1, and the 9-1-1 checkpoint clamp. These interactions are enhanced after oxidative stress. SIRT6, APE1, and Hus1 all bind the interdomain connector (IDC) of MYH at overlapping but distinct motifs and do not compete; instead, each partner enhances the others' association with MYH. MYH and SIRT6 are co-recruited to oxidative DNA damage sites in transcriptionally active chromatin; Sirt6 depletion causes MYH foci to localize on telomeres.\",\n      \"method\": \"Co-IP, site-directed mutagenesis of IDC, immunofluorescence at laser-induced damage sites, chromatin fractionation\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, mutagenesis mapping, co-localization at damage sites, multiple interaction partners tested orthogonally in same study\",\n      \"pmids\": [\"26063178\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Functional complementation assay in MutY-disrupted E. coli for 47 MUTYH missense variants established which variants severely impair MUTYH glycosylase function (fail to suppress G:C→T:A mutations) vs. retain near-wild-type activity. Structural prediction based on MutY crystal structure allowed interpretation of effects on catalytic activity or protein stability.\",\n      \"method\": \"In vivo complementation assay (spontaneous mutation rate in MutY-deficient E. coli), site-directed mutagenesis, in silico structural modeling\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — functional in vivo assay with 47 variants; single lab, complemented by structural modeling but no direct biochemical reconstitution of human protein\",\n      \"pmids\": [\"25820570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"BER/SSBR proteins including MYH are present on nascent DNA at replication forks, demonstrated by iPOND (isolation of proteins on nascent DNA) coupled with targeted mass spectrometry, establishing that MYH operates post-replicatively at the replication fork.\",\n      \"method\": \"iPOND combined with targeted mass spectrometry on nascent DNA in human cells\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — iPOND/MS directly identifies MYH on nascent DNA; single lab but rigorous biochemical approach\",\n      \"pmids\": [\"28575236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Wild-type human MUTYH contains a redox-active [4Fe4S] cluster. The pathogenic variant MUTYH C306W (cysteine ligating the cluster replaced by tryptophan) undergoes rapid oxidative degradation of its [4Fe4S]2+ cluster to [3Fe4S]+, abolishing redox signalling, reducing DNA binding, and impairing enzymatic function. This demonstrates that redox activity of the [4Fe4S] cluster is essential for MUTYH's DNA damage localization mechanism.\",\n      \"method\": \"DNA electrochemistry, EPR spectroscopy, DNA binding assay, glycosylase activity assay, site-directed mutagenesis\",\n      \"journal\": \"Nature chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrochemical measurement of redox activity, EPR confirmation of cluster degradation, biochemical activity assays; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"29915346\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of mouse MUTYH in complex with DNA and of the MUTYH C-terminal domain with human PCNA revealed the molecular mechanism for A:8-oxoG mispair recognition and excision, including the role of PCNA in replication-coupled repair. The Zn-binding motif in the IDC was resolved as one histidine and three cysteine residues. The IDC surface exposure explains interaction modes with 9-1-1 and APE1. Several MAP mutations perturb residues critical to catalytic function.\",\n      \"method\": \"X-ray crystallography (MUTYH–DNA complex; MUTYH C-terminal domain–PCNA complex), structural analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structures with functional validation of catalytic mechanism and interaction interfaces; single study with multiple complex structures\",\n      \"pmids\": [\"34142156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"UV-DDB stimulates MUTYH turnover 4–5-fold by directly interacting with MUTYH and displacing it from abasic sites (product inhibition relief). Single-molecule fluorescence showed UV-DDB decreases MUTYH half-life on abasic-site DNA from ~8800 s to ~590 s. EMSA and AFM confirmed transient complex formation between MUTYH and UV-DDB.\",\n      \"method\": \"Bulk kinetic assay, EMSA, atomic force microscopy, single-molecule fluorescence imaging\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — single-molecule kinetics plus bulk assay plus AFM; multiple orthogonal methods in one study rigorously establishing mechanism of product release\",\n      \"pmids\": [\"34232996\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MUTYH-mediated base excision repair in microglia promotes microglial activation and photoreceptor cell death in a mouse model of retinitis pigmentosa (rd10 mice). Mutyh deficiency prevented SSB formation in microglia, suppressed microglial activation and the inflammatory/cytotoxic phenotype under oxidative stress, and reduced photoreceptor cell death.\",\n      \"method\": \"Mutyh knockout in rd10 mouse model, immunofluorescence for SSBs and PARP activation, primary microglial culture under oxidative stress, histopathology\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in disease mouse model with mechanistic SSB/PARP pathway readouts and primary cell validation; single lab\",\n      \"pmids\": [\"27699246\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Werner syndrome helicase (WRN) is recruited to 8-oxoG:A mispairs in a manner dependent on DNA polymerase λ (Polλ). MUTYH is required for nuclear focus formation of both WRN and Polλ following oxidative stress. WRN binds the catalytic domain of Polλ and specifically stimulates gap-filling by Polλ over 8-oxoG. MUTYH depletion suppresses hypersensitivity of WRN/Polλ-deficient cells to oxidative stress.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence (focus formation), siRNA knockdown, cell viability assay, in vitro DNA synthesis assay with purified proteins\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, genetic epistasis via siRNA, biochemical reconstitution of WRN stimulation of Polλ, co-localization; multiple orthogonal methods\",\n      \"pmids\": [\"22753033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MUTYH glycosylase activity on 8-oxoG-containing trinucleotide repeat sequences generates closely spaced incisions on opposite strands (together with OGG1), creating conditions permissive for CAG/CTG repeat expansion in vitro. This was confirmed in R6/2 HD mouse brain areas showing elevated 8-oxodG and expression of both glycosylases.\",\n      \"method\": \"In vitro BER assay on TNR substrates with purified OGG1, MUTYH, and pol β; immunohistochemistry and 8-oxodG measurement in HD mouse brain\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution on TNR substrates plus in vivo mouse brain correlation; single lab, mechanistic but not fully reconstituted with all repair factors\",\n      \"pmids\": [\"26980281\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MUTYH (MYH) is a base-excision repair adenine-DNA glycosylase that removes mispaired adenine from A:8-oxoG lesions arising after oxidative DNA damage or misincorporation during replication; it operates post-replicatively at the replication fork in complex with PCNA, coordinates sequentially with APE1 (whose activity it transiently suppresses via its C-terminal domain), DNA pol λ, FEN1, and DNA ligase I to complete repair; its interdomain connector (IDC) harbors a Zn-binding motif and serves as a scaffold for interactions with the 9-1-1 checkpoint clamp (Hus1/Rad1), APE1, SIRT6, and WRN, all of which enhance repair efficiency; the [4Fe4S] cluster in MUTYH is redox-active and mediates rapid DNA-mediated localization to lesions; MUTYH-generated single-strand breaks also trigger two distinct p53/PARP- and calpain-dependent caspase-independent cell death pathways that suppress tumorigenesis, but under conditions of chronic oxidative stress in neurons and microglia these same pathways drive neurodegeneration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MUTYH is a base-excision repair adenine-DNA glycosylase that removes adenine misincorporated opposite 8-oxoguanine (A:8-oxoG), suppressing the G:C→T:A transversions that arise from oxidative DNA damage [#4, #16]. It functions in both nuclear and mitochondrial genomes, with compartment targeting governed by alternative splicing and an intact C-terminal region required for nuclear localization [#0, #2]. Structural and biochemical work resolved how MUTYH recognizes and excises the A:8-oxoG mispair and how its C-terminal domain engages PCNA for replication-coupled repair, consistent with its detection on nascent DNA at replication forks [#16, #14]. After adenine excision, MUTYH coordinates downstream steps: its C-terminal domain transiently protects the abasic product from premature APE1 incision and OGG1 action [#1], while UV-DDB relieves this product inhibition to accelerate MUTYH turnover from abasic sites [#17], and DNA polymerase λ, FEN1, and DNA ligase I complete repair [#5]. The interdomain connector, which carries a Zn-binding His/Cys motif, is a scaffold for partners that enhance repair efficiency, including the 9-1-1 checkpoint clamp (Hus1/Rad1), APE1, and SIRT6, which assemble at oxidative damage sites without mutual competition [#3, #9, #12]; MUTYH also organizes WRN and Pol λ focus formation at 8-oxoG:A lesions [#19]. A redox-active [4Fe4S] cluster is essential for DNA-mediated localization to lesions, and its loss in pathogenic variants abolishes redox signalling and impairs activity [#15]. Beyond repair, MUTYH-generated single-strand breaks initiate p53- and PARP-dependent and calpain-dependent caspase-independent cell death pathways that suppress tumorigenesis but drive neurodegeneration, microglial activation, and photoreceptor loss under chronic oxidative stress [#7, #8, #11, #18]. Numerous MUTYH missense and truncating variants abolish glycosylase and DNA-binding activity, linking loss of this repair function to colorectal tumorigenesis [#4, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that MUTYH initiates oxidative base-excision repair in both nuclear and mitochondrial genomes, defining the compartmental scope of its action via alternative splicing.\",\n      \"evidence\": \"Subcellular fractionation, immunodetection, and splicing analysis in human cells\",\n      \"pmids\": [\"11554314\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Splice isoform sequences not fully mapped\", \"Relative repair contribution of each compartment not quantified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Showed that the MUTYH C-terminal domain protects the abasic product from premature APE1/OGG1 action, revealing intrinsic coordination of repair handoff; nuclear localization was mapped to the intact C-terminal region.\",\n      \"evidence\": \"In vitro glycosylase/cell-free extract assays with mutagenesis; RT-PCR and immunofluorescence of a splice variant\",\n      \"pmids\": [\"15199168\", \"15180946\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Structural basis of product protection not resolved here\", \"Nuclear import signal not precisely defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the 9-1-1 checkpoint clamp (Hus1/Rad1) as a direct MUTYH partner that stimulates glycosylase activity, connecting base repair to DNA damage checkpoint signalling.\",\n      \"evidence\": \"Reciprocal Co-IP across species, yeast two-hybrid mapping, glycosylase assay, mutagenesis, co-localization\",\n      \"pmids\": [\"16879101\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Stoichiometry of the MUTYH–9-1-1 complex unknown\", \"In vivo checkpoint consequence of this interaction not quantified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Systematically classified disease-associated MUTYH variants by their glycosylase and DNA-binding defects, providing a functional basis for genotype interpretation.\",\n      \"evidence\": \"In vitro glycosylase and DNA binding assays on purified recombinant variants\",\n      \"pmids\": [\"18534194\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"In vitro defects not all linked to clinical outcomes\", \"Effects on protein stability vs catalysis not separated for all variants\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstituted the complete A:8-oxoG repair pathway and showed MUTYH recruits pol λ, PCNA, FEN1, and DNA ligase, while genetic epistasis distinguished MUTYH from MSH2-dependent oxidative repair.\",\n      \"evidence\": \"In vitro BER reconstitution with purified proteins, recruitment immunofluorescence, and Msh2/Mutyh double-knockout mouse analysis\",\n      \"pmids\": [\"19820168\", \"19435918\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Order and timing of factor handoffs not fully resolved\", \"Tissue-specificity of MSH2/MUTYH overlap unexplained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated that MUTYH-generated single-strand breaks initiate two distinct caspase-independent cell death pathways (nuclear PARP-dependent, mitochondrial calpain-dependent), reframing MUTYH as both a repair enzyme and a death-signalling trigger.\",\n      \"evidence\": \"Knockout mouse models with PARP and calpain inhibitor pharmacology and SSB measurement\",\n      \"pmids\": [\"21235684\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Molecular link from SSB to each death effector incomplete\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended the death-pathway model to neurodegeneration and identified WRN/Pol λ as MUTYH-dependent downstream repair factors at 8-oxoG:A lesions.\",\n      \"evidence\": \"Multiple genetic KO mouse combinations with pathway dissection; Co-IP, focus-formation, siRNA, and in vitro Pol λ stimulation assays\",\n      \"pmids\": [\"23143307\", \"22753033\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Triggers of compartment-specific death not fully defined\", \"Human neuronal relevance not directly tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Mapped the APE1 interaction to the MUTYH interdomain connector at residue level and showed Hus1 stabilizes the complex, defining the IDC as a multi-partner repair scaffold; cellular assays confirmed a protective role against oxidative stress.\",\n      \"evidence\": \"NMR chemical shift perturbation, Co-IP, in vitro binding; siRNA/overexpression with viability and 8-oxoG readouts\",\n      \"pmids\": [\"24209961\", \"24315136\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Dynamics of partner exchange on the IDC unresolved\", \"Cellular phenotype work is single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Placed MUTYH transcriptionally downstream of p53 and mechanistically within a p53/PARP-dependent caspase-independent death pathway, linking repair capacity to tumor-suppressive cell death.\",\n      \"evidence\": \"p53-binding-site luciferase reporter, siRNA, and pharmacological inhibitor epistasis in colorectal cancer cells\",\n      \"pmids\": [\"25310643\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct p53 occupancy in vivo not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined SIRT6 as an additional IDC partner that, with APE1 and Hus1, cooperatively enhances complex assembly and chromatin recruitment; an E. coli complementation screen functionally classified 47 variants.\",\n      \"evidence\": \"Co-IP, IDC mutagenesis, laser-damage co-localization, chromatin fractionation; in vivo MutY-complementation assay with structural modeling\",\n      \"pmids\": [\"26063178\", \"25820570\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional role of telomeric MYH relocalization upon SIRT6 loss unknown\", \"Complementation lacks human-protein biochemical reconstitution\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established that MUTYH operates post-replicatively at the replication fork by detecting it on nascent DNA.\",\n      \"evidence\": \"iPOND coupled with targeted mass spectrometry on nascent DNA\",\n      \"pmids\": [\"28575236\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Direct coupling to fork-associated machinery not shown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated that the redox-active [4Fe4S] cluster is essential for MUTYH's DNA-mediated lesion localization, and that a pathogenic variant disrupts cluster integrity.\",\n      \"evidence\": \"DNA electrochemistry, EPR, DNA binding and glycosylase assays with mutagenesis\",\n      \"pmids\": [\"29915346\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"In vivo contribution of redox search to repair kinetics not quantified\", \"Generality across other variants untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the structural basis of A:8-oxoG recognition and PCNA-coupled repair and defined the IDC Zn-binding motif; identified UV-DDB as a turnover factor that relieves MUTYH product inhibition at abasic sites.\",\n      \"evidence\": \"X-ray crystallography of MUTYH–DNA and MUTYH C-terminal–PCNA complexes; bulk kinetics, EMSA, AFM, and single-molecule imaging of UV-DDB displacement\",\n      \"pmids\": [\"34142156\", \"34232996\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Coordination of UV-DDB with APE1/PCNA handoff not integrated\", \"Human full-length structure with partners not solved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Showed disease contexts where MUTYH activity is deleterious: microglial BER drives photoreceptor death in retinitis pigmentosa, and MUTYH/OGG1 incisions on 8-oxoG-containing repeats create conditions for trinucleotide-repeat expansion.\",\n      \"evidence\": \"Mutyh KO in rd10 mouse with SSB/PARP readouts; in vitro BER on TNR substrates with HD mouse brain correlation\",\n      \"pmids\": [\"27699246\", \"26980281\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Causality of MUTYH in human repeat-expansion disease not shown\", \"Full repeat-expansion mechanism not reconstituted\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the competing repair-completing and death-signalling fates of a MUTYH-generated abasic site/SSB are selected in vivo, and how partner exchange on the IDC is temporally regulated, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No mechanism distinguishing productive repair from death-triggering breaks\", \"Temporal ordering of IDC partner binding unknown\", \"Mitochondrial MUTYH repair pathway less characterized than nuclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140097\", \"supporting_discovery_ids\": [4, 5, 16]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [4, 15]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [3, 9, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [14, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [4, 5, 16]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [7, 8, 11]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [10, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 18, 20]}\n    ],\n    \"complexes\": [\"9-1-1 (Hus1/Rad1) checkpoint clamp\"],\n    \"partners\": [\"APE1\", \"HUS1\", \"RAD1\", \"SIRT6\", \"PCNA\", \"WRN\", \"POLL\", \"DDB2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}